// ------------------------------------------------------------------------------
// 
// Copyright (c) 2008 Swampware, Inc.
// 
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
// 
// ------------------------------------------------------------------------------
using System;

namespace wave
{
	/// <summary>
	/// Summary description for ConsoleEvaluator.
	/// </summary>
	public class ConsoleEvaluator : Water.Evaluator
	{
		private Water.Evaluator _evaluator;
		private bool _catchErrors;

		public ConsoleEvaluator(Water.Evaluator evaluator, bool catchErrors)
		{
			this._evaluator = evaluator;
			this._catchErrors = catchErrors;
		}

		public override object Evaluate(object o, Water.Environment environment)
		{
			if(this._catchErrors)
			{
				try
				{
					object result = this._evaluator.Evaluate(o, environment);
					if (result != null)
					{
						Water.Output.WriteLine(Water.Generator.QuickGenerate(result, "", ""));
					}
					return result;
				}
				catch (System.Exception exception)
				{
					wave.ErrorPrinter.PrintError(exception, environment.CopyVariableStack("_Statement"));
					return null;
				}
			}
			else
			{
				object result = this._evaluator.Evaluate(o, environment);
				if (result != null)
				{
					Water.Output.WriteLine(Water.Generator.QuickGenerate(result, "", ""));
				}
				return result;
			}
		}

	}
}
